This image was published in a Public Library of Science journal. Their website states that the content of all PLoS journals is published under the Creative Commons Attribution 2.5 licenseThis file is licensed under Creative Commons Attribution 2.5 License
In short: you are free to distribute and modify the file as long as you attribute its author(s) or licensor(s). Image Author: James Gathany, CDCSource A New Model for Predicting Outbreaks of West Nile Virus. Gross L, PLoS Biology Vol. 4/4/2006, e101. http://dx.doi.org/10.1371/journal.pbio.0040101. See also: Kilpatrick AM, Kramer LD, Jones MJ, Marra PP, Daszak P (2006) West Nile Virus Epidemics in North America Are Driven by Shifts in Mosquito Feeding Behavior. PLoS Biol 4(4): e82 http://dx.doi.org/10.1371/journal.pbio.0040082

English: Larvae of Culex Mosquitoes. As seen on the picture, larvae make dense groups in standing water. A shift in the feeding behavior of those mosquitoes helps explain the rising incidence of West Nile virus in North America. It appears that the darker structure at the top center of the image is one pupa.
Français : Larves de moustiques du genre Culex. Comme le montre la photo, les larves forment des groupes compacts dans les eaux stagnantes. Un changement dans le comportement nutritionnel de ces moustiques permet d'expliquer l'augmentation de la prévalence du West Nile virus en Amérique du nord.

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